Questions Weimar period

[policeluger]

Please, what is the basis, the research to prove that .30 cal police Lugers were used ?....I know that .30 cal barrel were taken off .30 cal commercial guns with a 7.65 chamber marking, the chamber marking was xxx'ed out and the gun was put into service....but I have never heard of .30 cal's in service.....please if you can give any additional info you may have.